Some very old accounts auto added some adjustment to the opening balance, how can i find out what had changed by the system update?
for example the share capital account, it have $10 but now become $20, the system added a opening balance.
It is impossible to answer your question based on the limited information you furnished. Very likely, however, this is related to the recent changes to start dates and starting balances under cash basis accounting. See this topic: Start date no longer required.